A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5895-00-036-8524
NSN 6110-01-412-9334
NSN 6620-00-057-2764
NSN 6110-00-823-2365
NSN 5945-00-677-3931
NSN 5905-01-010-3320
NSN 5996-01-633-7979
NSN 6130-01-546-4838
NSN 5925-01-026-9649
NSN 5835-01-412-0344
NSN 6610-01-152-1463
NSN 5965-01-393-5833